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EM77950 Datasheet(PDF) 83 Page - ELAN Microelectronics Corp

Part # EM77950
Description  BB Controller
PDF  102 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  EMC [ELAN Microelectronics Corp]
Direct Link  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

EM77950 Datasheet(HTML) 83 Page - ELAN Microelectronics Corp

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EM77950
BB Controller
Product Specification (V1.0) 10.09.2007
• 75
(This specification is subject to change without further notice)
11 Dual Pulse Width Modulations (PWM0 and PWM1)
11.1
Overview
The EM77950 has two built-in PWM outputs with 16-bit resolution. Fig.11-1 shows the
functional block diagram. A PWM output has a period and a duty cycle, and it keeps the
output high. The baud rate of the PWM is the inverse of the period. Fig. 11-2 depicts
the relationships between a period and a duty cycle.
Duty
Compare
Circuit
Period
Circuit
Q
S
R
PWM1
PWM1IF
PWM0IF
Duty
Compare
Circuit
Period
Compare
Circuit
Q
S
R
PWM0
TMR0HB
TMR0LB
PRD1H
PRD1L
TMR1HB
TMR1LB
DT1H
DT1L
Set as
compare
match
Set as
compa
re
match
Set as
compare
match
Set as
compare
match
Compare
Q
S
R
PWM1IE
Duty
Compare
Circuit
PWM0IE
DL1L
DL1H
DL0H
DL0L
DT0H
DT0L
PRD0H
PRD0L
MUX
Fosc/2
MUX
Fosc/2
PWM1E
S_PWM0
S_WMP1
PWM0E
PWM0E
PWM1E
Fig. 11-1 The Functional Block Diagram of the Dual PWM
Period
Period
Period
Duty
Duty
Duty
DUTY = TMR
PRD= TMR
Fig. 11-2 PWM Output Timing Diagram



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